Reactive plasma spraying of wear-resistant coatings
- Drexel University, Philadelphia, PA (United States)
A method for producing wear-resistant, carbide-reinforced coatings has been investigated. A conventional low-pressure plasma gun has been modified with a downstream reactor into which carbon-containing gases are mixed, heated, and disassociated. The disassociated gas ions - H* and C* - are subsequently brought into contact with heated, molten metal matrix powders. Experiments with NiCr/Ti blends and W powders have shown that uniformly dispersed carbides such as TiC, Cr(x)C(y), WC, and W2C were formed in situ on the metal precursor powders during deposition. The in situ formed particles, being formed directly from the matrices, show excellent matrix cohesion and lead to high and uniform deposit microhardnesses. The process is described, and several evaluations of materials, reactive gases, and spray conditions are reported. Microanalysis of the coatings are presented, microhardness values are reported, and XRD identifies the in situ formed phases. 14 refs.
- OSTI ID:
- 7111204
- Journal Information:
- Journal of Thermal Spray Technology; (United States), Journal Name: Journal of Thermal Spray Technology; (United States) Vol. 1:1; ISSN 1059-9630; ISSN JTTEE
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
AEROSPACE INDUSTRY
CARBIDES
CARBON COMPOUNDS
CARBON IONS
CHARGED PARTICLES
CHROMIUM CARBIDES
CHROMIUM COMPOUNDS
COATINGS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DEPOSITION
DIFFRACTION
DISSOCIATION
ELEMENTS
FLUIDS
HARDNESS
HYDROCARBONS
HYDROGEN IONS
INDUSTRY
IONS
LIFETIME
LIQUID METALS
LIQUIDS
MECHANICAL PROPERTIES
METALS
MICROANALYSIS
MICROHARDNESS
MICROSTRUCTURE
NICKEL CARBIDES
NICKEL COMPOUNDS
ORGANIC COMPOUNDS
PHASE STUDIES
PLASMA ARC SPRAYING
PROTECTIVE COATINGS
REFRACTORY METAL COMPOUNDS
SCATTERING
SERVICE LIFE
SPRAY COATING
SURFACE COATING
TITANIUM CARBIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN CARBIDES
TUNGSTEN COMPOUNDS
WEAR RESISTANCE
X-RAY DIFFRACTION